[EJB/JBoss] - lookup NoClassDefFoundError
by merabi
hi all.
I'm facing a lookup can't find error for about a day....
I have created a EAR file called "Ad.ear".
Inside of the EAR file, there is a JAR&WAR files.
In Jar file, I have a Remote interface called "ResetObj" and implemented Stateless Session bean called "ResetObjBean".
Here's what I'm tryin to do.
I created another EAR file called Ad2.ear which only contains the Servlet.
>From the servlet, I'm tryin to call the Remote Session Bean like this:
| Context ctx = new InitialContext();
| ResetObj rst = (ResetObj )ctx.lookup("Ad/ResetObjBean/remote"); //this part fails
| rst.resetObject();
|
but the prob is that it gives me following error:
java.lang.NoClassDefFoundError: ad/session/flow/ResetObj
| java.lang.Class.getDeclaredConstructors0(Native Method)
| java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
| java.lang.Class.getConstructor0(Unknown Source)
| java.lang.Class.newInstance0(Unknown Source)
| java.lang.Class.newInstance(Unknown Source)
| org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
| org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
| org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
| org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
| org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
| org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
| org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
| org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
| org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
| java.lang.Thread.run(Unknown Source)
JBoss:4.0.5GA
JVM:1.5.0_10
I've set ClassPath to both JAVA_HOME and JBOSS_HOME.
PLZ help!
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17 years, 4 months
[EJB 3.0] - Re: ejb-jar.xml a clear definition for EJB3
by oskar.carlstedt
Hello!
No, in general you don't need the ejb-jar.xml. You can include the ejb-jar.xml file if you intend to override settings from given annotations. But in generel, you don't need it.
What you need to do is:
Create a JAR-file with the ejb:s you want to deploy. This file must also include a META-INF/persistence.xml file where you ponit out the datasource you wan't to use. Here is an example:
| <persistence xmlns="http://java.sun.com/xml/ns/persistence"
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
| xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
| http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
| version="1.0">
| <persistence-unit name="my-ejbs">
| <jta-data-source>
| java:/my-ejbs-DS
| </jta-data-source>
| <properties>
| <!--
| <property name="hibernate.hbm2ddl.auto" value="create-drop" />
| -->
| <property name="show_sql" value="true" />
| <property name="dialect"
| value="org.hibernate.dialect.MySQLDialect" />
| </properties>
| </persistence-unit>
| </persistence>
|
The structure of the final jar file containing the ejb:s is something like:
| /my-ejbs.jar
| /META-INF
| MANIFEST.MF
| persistence.xml
| /my
| /example
| /bean
| MyBean.class
| ...
|
Then you need to create an ear-file. This is not a must, but you get better structure if you deploy your ejbs in an ear file. You still need to specify the META-INF/application.xml file. Here is an example:
| <?xml version="1.0" encoding="UTF-8"?>
| <application
| xmlns="http://java.sun.com/xml/ns/j2ee"
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
| xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/application_1_4.xsd"
| version="1.4">
| <description>my application description</description>
| <display-name>my-application</display-name>
|
| <!--
| Point out the ejb jar files as ejb modules
| -->
| <module>
| <ejb>my-ejbs.jar</ejb>
| </module>
|
| <!--
| Point out the war files as web modules
| -->
| <module>
| <web>
| <web-uri>my-service-jaxws-web.war</web-uri>
| <context-root>/my-service-jaxws-web</context-root>
| </web>
| </module>
| </application>
|
A good idea is also to bundle the dependent jar files in the ear file. Place them in the lib folder of the ear file. In the META-INF folder you create a jboss-app.xml file where you tell jboss to use the libs you provide in the ear file. Note that if you do this way and also include a war file in the ear - then make sure you don't have any WEB-INF/libs/... in the war file. Here is an example:
| <!DOCTYPE jboss-app
| PUBLIC "-//JBoss//DTD J2EE Application 1.4//EN"
| "http://www.jboss.org/j2ee/dtd/jboss-app_4_0.dtd">
| <jboss-app>
| <loader-repository>my-ejbs:app=ejb3</loader-repository>
| </jboss-app>
|
So finally, this is the structure of the ear file:
| my-service.ear
| /my-ejbs.jar
| /lib
| dependency_jar_A.jar
| dependency_jar_B.jar
| ...
| /META-INF
| MANIFEST.MF
| application.xml
| jboss-app.xml
|
Kind regards
Oskar
View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4042766#4042766
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17 years, 4 months